Venturi dust collector



June22, 1943. w, s. BOWEN I VENTURI DUST COLLECTOR Filed April 19, 1941- 2 Sheets-Sheet l INVENTOR w. s. BOWEN VENTURI DUST COLLECTOR June 22, 1943.

Filed April 19, 1941 2 Sheets-Sheet 2 INVENTOR mLL/AM SPL-NCER BowE/v WM \W V ATI'ORN tion.

Patented June OFFICE I VENTURI DUST COLLECTOR William Spencer Bowen, Westfield, N. J.

' Application April 19, 1941, Serial No. 389,261 (on. 183-80) 11 Claims.

The present invention relates to separating and collecting mechanism by means of which entrained particles may be separated from an entraining fluid, and embodies, more particularly, an improved form of separating and collecting mechanism by means of which the particles may be separated from the cntraining fluid without the building up of pressures within the collecting mechanism. v

Devices have heretofore been provided by means of which a fluid having particles entrained therein is subjected to a whirl in order to cause the particles to be-subjected to centrifugal force, and the particles, together with as small an amount as possible of the entraining fluid, are separated by skimming fromthe main flow of fluid. Patent No. 2,082,242.

It has been found, in operation of devices of this character, that there is a tendency to build up a back pressure within the collecting mechanism and thus to reduce the efficiency of collec- In accordance with the present invention. it is proposed to provide a mechanism by means of which the tendency to build up back pressures in the collected mechanism may be avoided, thus materially improvin the efilciency of collection.

A further object of the invention is to provide a mechanism by means of which the fluid that is skimmed on with the particles is returned to the main body of fluid flowing through the device at a point beyond the skimming element in the direction of flow of the fluid through the device.

A further object of the invention is to provide a device of the above character wherein the skimmed fluid and particles are maintained in a relatively quiescent stage and treated in such fashion that the particles are collected while the excess fluid is returned to the main separating device. 1

A further object of the invention is to provide a mechanism of the above character wherein the flow of fluid through the device is treated in such fashion that the return of the skimmed fluid to the main flow of fluid through the device is facilitated after the entrained particles have been removed therefrom.

The invention is attained by providing a suit- This is illustrated in applicant's prior.

formed with a device for removing the whirl from the main body of fluid after the separation has been accomplished and the skimmed fluid is returned to the main body of fluid from which the whirl has been removed.

Further objects of the invention will appear as it is described in greater detail in connection with the accompanying drawings, wherein:

Fig. 1 is a view in vertical section, taken through a device constructed in accordance with the present invention.

Fig. 2 is a partial view in section, taken on the line 2.2- of Fig. 1 and looking in the direction of the arrows.

Fig. 3 is a view in end elevation, looking from the left in Fig. 1.

Fig. 4 is a view in end elevation looking from the right in Fig. l, the mechanism being partly broken away and in section in order. to illustrate certain features of the connecting chamber.

Referringto the above drawings, the separating and collecting device is shown asbeing formed as a venturi having an inlet converging cone in, a throat section I I, and an outlet diverging cone II. The inlet cone is provided with a housing l3 within which spirally arranged vanes l4 are provided in order to subject the fluid bearing entrained particles to a violent whirl or twist, thus substream-lined hub I5 in accordance with the usual practize. It will thus be seen that the fluid bearing the particles in suspension will enter the converging inlet portion I0 with a violent whirling th'erethrough.- To this end, the mechanism is motion, thus throwing the particles outwardly against the converging walls Ill.

Adjacent the throat of the mechanism, a secondary converging Venturi cone I6 is provided, being spaced from the cone III to provide an annular slot I! through which the particles pass as they are skimmed from the main stream of fluid flowing through the de-' vice. The secondary cone I6 is provided with a plurality of vanes Hi to remove the twist or whirl from the fluid flowing through the device in order that it may flow through the throat ll of the venturi with a smooth lamellar streamline flow. In this fashion, and in accordance with the recognized laws governing the operation of a Venturi section, the velocity in the throat section II is greatly increased and the pressure in such section decreased. The fluid then flows out through the expanding cone 1! and is carried awayin any desired fashion.

About the throat section of the mechanism there is provided a collecting chamber is having a hopper 20 or other suitable mechanism for collecting the entrained particles that are.

skimmed of! from the main flowthrough the slot I1. Slots 2| are formed in the throat section ll of the venturi and communicate with the hopper 20 through suitably arranged baflies an elongated slot 26 in order that the total area of the openings 21 may be varied as desired.

This is accomplished by rotating the sleeve 25' about the axis of the mechanism, as will be readily apparent.

From the foregoing description, it will be apparent that the operation of the device is such that the fluid having particles in suspension is subjected to a violent whirl by means of the vanes it upon entering the mechanism. The converging cone Ill increases the velocity of flow of the fluid and, due to the action of centrifugal force, the particles will be directed against the converging walls of the inlet in and be skimmed of! through the slot l1. At the same time, some of the fluid will be skimmed from theflo'w of the main fluid and will enter the relatively quiescent collecting chamber i9. The main body of the fluid will enter the secondary entrance cone l8 oi the venturi and by means of the vanes i8 will havethe whirl removed therefrom. This will cause the fluid to continue through the throat section of the venturi, in which section its velocity is greatly increased, while its pressure is correspondingly reduced. This rovides a section of relatively low pressure in the throat portion of the mechanism and the fluid within the chamber is is thus drawn oil and returned to the main bod of fluid that is flowing into the diverging o'r outlet section I! of the mechanism.

The banles 22 facilitate the collection of the entrained particles within the hopper 20 and 1. Separating-and collecting mechanism com-- prising a first chamber through which a stream of particle laden fluid is adapted to flow, means to separate from saidstream a portion of said fluid and particles entrained therein, areceiving chamber to receive the said separated fluid and particles, means to establish a substantially smooth lamellar flow in the flrst chamber beyond the separating means in the direction of flow. and means to return fluid in .the receivin chamber back into the'lamellar flow in the first chamber.

2. Separating and collecting mechanism comprising a flrst chamber through which a stream oi particle laden fluid is adapted to flow, means to separate from said stream a portion of said fluid and particles entrained therein, a receiving chamber to receive the said separated fluid and particles, means to establish a substantially smooth lamellar flow in the first chamber beyond theseparating means in the direction of flow, and an opening in the first chamber communicating with the region of lamellar flow to return fluid in the receiving chamber to the first I chamber.

3. Separating and collecting mechanism comprising a first chamber through which a stream of particle laden, fluid is adapted to flow, means to separate from said stream a portion of said fluid and particles entrained therein, a receiving chamber to'receive the said separated fluid and particles, means to establish a substantially smooth lamellar flow in the flrst chamber beyond theseparating means in the direction 0! flow, an opening in the first chamber communicating with the region of lamellar flow to return fluid in the receiving chamber to the flrst chamber, and means to vary the size of said opening.

4. Separating and collecting mechanism comprising a first chamber through which a stream of particle laden fluid is adapted to flow, means to separate from said stream a portion of said fluid andparticles entrained therein, a receiving chamber to receive the said separated fluid and particles, means to establish a substantially smooth lamellar flow in the first chamber beyond the separating means in thedirection of flow, an opening in the first chambercommunicating with the region of lamellar flow to return fluid in the receiving chamber to the first chamber, and means to prevent entrainment of particles in the returning fluid.

5. Separating and collecting mechanism comprising a chamber through which a stream of particle laden fluid is adapted to flow, means to impart a whirl to the fluid and particles, means to separate from said stream a portion of said fiuid and particles entrained therein, a receiving chamber to receive the said sepjarated fluid and particles, means beyond the separating means in the direction of flow to remove the whirl from the fluid, andmeans to return fluid from the a receiving back to the flrst chamber in the region beyond the whirl removing means.

6. Separating and collecting mechanismcomprising a chamber through which a stream oi particle laden fluid is adapted toflow. means to impart .a whirl to the fluid and particles, means to separate from said stream a portion of said fluid and particles entrained therein, a receiving chamber to receive the said separated fluid and particles, means beyond the separating means in the direction of flow to remove the whirl from the fluid, and an opening in the flrst chamber beyond the whirl removing means in the direction of flow and communicating with the receiving chamber to return fluid from the receiving to the first chamber. 7. Separating and collecting mechanism comprising a chamber through which a stream of particle laden fluid is adapted to flow, means to impart a whirl to the fluid and particles; means .to separate from said stream a portion of said fluid and particles entrained therein, a receiving chamber to receive the said separated'fluid and particles, means. beyond the separating means in the direction of flow to remove the whirl from the fluid, an opening in the first chamber beyond the whirl removing means in the direction oi 8. Separating and collecting mechanism comprising a chamber through which a stream of particle laden fluid is adapted'to flow, means to impart a whirl to the fluid and particles, means to separate from said stream a portion of said fluid and particles entrained therein, a receiving chamber to receive the said separated fluid and particles, means beyond the separating means in the direction of flow to remove the whirl from the fluid, an opening in the first chamber be yond the whirl removing means in the direction of flow and communicating with the receiving chamber to return fluid from the receiving to the first chamber, means to control the size of the opening, and baiile mechanism in the receiving chamber to separate particles from the fluid returning to the first chamber.

9. Separating and collecting mechanism comprising a Venturi device having an inlet cone,- a throat, and an outlet cone, means to direct a fluid having particles entrained therein into the inlet cone with a whirling motion, means to skim oi! particles and fluid adjacent the wall or the inlet portion, means to remove the whirling motion from the fluid entering the venturi throat, a chamber to reecive the skimmed parinlet cone with a whirling motion, a. secondaryinlet cone, spaced from the first inlet cone tov form an annular'skimming slot, a chamber to receive the skimmed particles and fluid, vanesin the secondary cone to remove the whirlfrom the fluid, and meansto return the fluid from the chamber to the Venturi throat.

l1. Separating and collecting mechanism comprising a Venturi device having an inlet cone, a throat, and an outlet cone, means to direct a fluid having particles entrained therein into the inlet cone with a whirling motion, a secticles and fluid, and means to return fluid from ondary inlet cone spaced from the first inlet cone to form an annular skimming slot, 8. chamber to receive theskimmed particles and fluid, vanes in the secondary cone to remove the whirl from the fluid and an aperture in the Venturi throat communicating with the chamber to re- .turn fluid from the chamber to the throat.

-- WILLIAM SPENCER BOWEN. 

